Uma breve história animada do calendário moderno

Publiquei ontem no Facebook, no mural do Projeto Memória :

Uma breve história animada do calendário moderno "Since the dawn of civilization, humanity has been trying to map and understand time. A cornerstone of these timekeeping efforts is the invention of the calendar, but how exactly did it begin? Jeremiah Warren has put together a brief animated history:" by Maria Popova

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